Embroidering-machine.



K. KELLER & L. HUNKEMULLER.

EMBROIDERING MACHINE. APPLICATION FILED MAR.12, 1913.

Patented Mar. 3, 1914.

JRVenZ OJ J 7M 7% lUhlll lfldD @TAllhlfi PATENT KARL KELLER AND LAURENZ HUNKEMULLER, 0F ABBON, SWITZERLAND, ASSIGNOI-LS TO THE FIRM OF ADOLPH SAURER, OF ARBON, SWITZERLAND.

EMBBOIDERING-MACHINE.

incense.

Specification of Letters Patent.

Patented Mar. 3, rain.

Application filed March 12, 1913. Serial Nov 753,773.

To all whom it may concern:

Be it known that we, KARL KELLER, a citizen of the Republic of Switzerland, and Lnonnnz HUnnnMoLLnn, a subject of the Emperor of Germany, residing both at Arbon, Switzerland, have invented new and useful Improvements in Embroidering-Machines; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

This invention relates to means for preventing torsion in the long, oscillating workshafts of embroidery machines. In prior attempts to prevent twisting in the needle ac uating shafts, the main shaft has been run throughout the entire length of the machine, and a second cam pro 'ided at the rear end, so that the needle actuating shaft may be rocked from both ends simultaneously. The principal defect of such construction is that the torsion in the needle actuating shaft is in reality merely replaced by torsion in the main shaft. Another proposal has been to actuate the rear end of the shaft of the thread guide with the aid of a spring, in order to overcome the torsion as far as possible; but in such case the rear end of the shaft is not driven with positive motion.

According to the present invention the work-shaft is actuated by a cam or other driving mechanism of well-known descrip tion, located in the usual manner at the working end of the machine only, and at this end of the shaft there is provided a special lever system, which is operated by the said main driving mechanism and transmits its motion by positively acting means to another lever system connected with the other end of the shaft. in this manner both ends of the shaft are turned positively tnrough an equal angle, so that torsion is avoided, while the drawbacks attaching to prior methods are obviated.

A preferred embodiment of the invention is illustrated in the accompanying drawing.

Figure 1 is a front elevation of so much of an embroidery machine as is necessary for a clear understanding of this invention.

Fig. 9. is a sectional view on the line A-A of Fig. 1 of the front part of the machine.

1 and 2 designate two shafts for operating the needle mechanism and coupled together by a system of levers 3, i, 5, motion being imparted to the lever 3 by a grooved cam 6. If these shafts 1, 2, were simply to be actuated so, torsion would occur, which in view of the great length of the shafts (say 30 ft.) would be such that the needles in the proximity of the cam 6 would have pierced completely, while those at the opposite end would not yet have penetrated sufficiently for the formation of a stitch, so that the embroidery would exhibit defects. In order to prevent this, there is provided on the lever 3 a gimbal joint 7, connect-ed by a rod 8 with another gimbal joint 9 at the end of a lever 10. This lever 10 has also two branch. arms 11, 12, which by means of rods or the like 13, 1 1, stretched taut by any suit able tension devices, are coupled with the arms 11, 12, of a like lever 10 connected by parts 7, 8, 9 corresponding to the parts 7, 8, 9, to the opposite end of the shaft 1, which is coupled with the sh aft 2 in the same manner as the front end.

With the above described construction, when the needle actuating shafts 1, 2 are rocked by the motion of the cam (3, they will be compelled to execute rotary motion of equal amplitude at both ends.

What we claim is:

1. In an embroidery machine, oscillatory workshafts, means located at one end of the machine for actuating the shafts, a me1nher fulcrumed at the same end of the machine, means connected by universal joints at one end to the member and at the other end to the shaft actuating means, for transmitting positive motion from the latter to the former, a member fulcrumed at the opposite end of the machine and positively coupled with the shafts, and means positively connecting the two members, substantially as described.

2. In an embroidery machine, oscillatory work-shafts, means located at one end of the machine for actuating the shafts, a three armed lever fulcrumed at the same end of the machine, means connected by gimhal joints at one end to the lever and at the other end to the shaft actuating means, for transmitting positive motion from the latter to th former, a like three armed lever fulcrumed at the opposite end of the machine, means presenting two gimbal o1nts coupling tie second lever positively with the shafts, and means positively connecting the two levers, substantially as described.

3. In an embroidery machine, a needle actuating shaft, means located at one end of the machine for rocking the shaft, a lever system located at the same end of the machine and positively operated by the shaft actuating means, a lever system at the opposite end of the machine and positively coupled with the shaft, and means positively connecting the two lever systems, substantially as described.

l. In an embroidery machine, a needle actuating shaft, means located at one end of the machine for rocking the shaft, a three armed lever fulcrumed at the same end of the machine, means connected by universal 20 joints at one end to the lever and the other end to the shaft rocking means, for transmitting positive motion from the latter to the former, a like three armed lever fulcrumed at theopposite end of the machine, means presenting two universal joints coupling the said second lever positively with the shafts, and means positively connecting the two levers, substantially as described.

In testimony that we claim the foregoing as our invention we have signed our names in presence of two subscribing witnesses.

KARL KELLER. N LAURENZ HUN KEMOLLER.

Witnesses EUGENE NABEL, RANDALL ATKINSON.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

